| Summary: | This archive contains identified negative, upper-tropospheric PV anomalies (short: PVAs$^{-}$) and their tracks for the period 1979-2021 over the Northern Hemisphere based on ERA5 reanalysis data and represents the basis for recent publications on atmospheric blocking dynamics (e.g., Oertel et al., 2023; Hauser et al., 2023; Wenta et al., 2024; Hauser et al., 2024). Details on the method to identify and track PVAs- are provided in Hauser et al. (2024). References: Hauser, S., Teubler, F., Riemer, M., Knippertz, P., and Grams, C. M. (2023): Towards a holistic understanding of blocked regime dynamics through a combination of complementary diagnostic perspectives, Weather and Climate Dynamics, 4, 399–425, https://doi.org/10.5194/wcd-4-399-2023 Hauser, S., Teubler, F., Riemer, M., Knippertz, P., and Grams, C. M. (2024): Life cycle dynamics of Greenland blocking from a potential vorticity perspective, EGUsphere [preprint], https://doi.org/10.5194/egusphere-2023-2945. Oertel, A., Pickl, M., Quinting, J. F., Hauser, S., Wandel, J., Magnusson, L., Balmaseda, M. Vitart, F. Grams, C. M. (2023): Everything Hits at Once: How Remote Rainfall Matters for the Prediction of the 2021 North American Heat Wave. Geophysical Research Letters, 50(3). https://doi.org/10.1029/2022GL100958. Wenta, M., Grams, C. M., Papritz, L., and Federer, M. (2024): Linking Gulf Stream air–sea interactions to the exceptional blocking episode in February 2019: a Lagrangian perspective, Weather and Climate Dynamics, 5, 181–209, https://doi.org/10.5194/wcd-5-181-2024. The identification and tracking of PVAs$^{-}$ is based on ERA5 reanalysis data on model levels from the European Centre for Medium-Range Weather Forecasts (ECMWF) with a horizontal resolution of 0.5° and a temporal resolution of 3 hours (Hersbach et al., 2020). The following data covering the period 1979 to 2021 are stored in this archive: (1) Fields of upper-tropospheric PV anomalies: A vertical, weighted average is performed based on model level ERA5 data between 500 and 150hPa. ...
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